22161393100 has 144 divisors (see below), whose sum is σ = 60131151360. Its totient is φ = 6887347200.

The previous prime is 22161393031. The next prime is 22161393157. The reversal of 22161393100 is 139316122.

It is a super-2 number, since 2×22161393100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2760292 + ... + 2768308.

It is an arithmetic number, because the mean of its divisors is an integer number (417577440).

Almost surely, 2^22161393100 is an apocalyptic number.

22161393100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22161393100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30065575680).

22161393100 is an abundant number, since it is smaller than the sum of its proper divisors (37969758260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22161393100 is a wasteful number, since it uses less digits than its factorization.

22161393100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8408 (or 8401 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 22161393100 in words is "twenty-two billion, one hundred sixty-one million, three hundred ninety-three thousand, one hundred".